Hi, Gentoo gang!
Sometimes (once or twice a week) my Gentoo completely freezes. I can't do nothing, keyboard and mouse buttons not responding, no Ctrl+Esc, Alt+Ctrl+Esc, Alt+Ctrl+F1 and so on. All the things I can do is just moving mouse pointer over the screen.
Every time this hang occures on Firefox launch. Firefox window not appeared, but system frozen yet. And I have to press hardware reset button.
What this problem related to? I haven't any idea on where this problem coming from.
Any suggestions on where to search for hang reason?

Do you have another OS? Does it crash too?
Do you have a network/Can you ssh into the machine when it hangs?
Are your keyboard LEDs blinking?
Can you crash without X11 started?_________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed to be advocating?

1. I haven't other linux installed at this desktop.
2. I have another desktop (with debian installed) at my home network - I using this machine as samba server. I communicating with server via putty(from Gentoo). Debian has not putty installed but it is not a problem to install it.
3. No keyboard LEDs blinking when system hangs
4. No any kind of crashes or other problems (except a hang that was described above).

Do you think I can realize something by connecting to hanged Gentoo from Debian over ssh?

Whoops, what I really meant is whether or not the machine is even slightly "alive" when it crashes... it would be nice to see if you could login to a shell remotely to see if it has any diagnostic information.

If you can't even login to it - and it doesn't reply to pings, coupled with no LED blinking, it's likely hardware issue. So the machine won't crash if you don't have X11 running and say, you're doing an emerge world?_________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed to be advocating?

@ eccerr0r:
Gentoo was installed from stage3, I never performing updates, just full re-installation. So no problem with incorrect updates.
I've just connected to Gentoo from Debian over ssh. Just for testing All fine, I'm ready to connect when Gentoo hangs next time, if it would be possible . What commands would be helpful for checking? top, free ... something else?

@ mv:
Yes, I'm using NVidia card, but I never used nouveau, currently I have nvidia 295.75 installed.

Recently my i7 has been crashing on me, X11 completely hangs, but I had Audacious playing music and it still keeps on playing despite video hang. I can ssh in fine too. Dmesg did report issues with the graphics driver (intel onchip).

This is the kind of data that would be helpful, but for me I'm not certain if it's a graphics driver issue or hardware issue yet..._________________Intel Core i7 2700K@ 4.1GHz/HD3000 graphics/8GB DDR3/180GB SSDWhat am I supposed to be advocating?